package com.yzwu.stream;

import org.junit.Before;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import java.util.stream.Stream;

public class TestTransaction {
	List<Transaction> transaction=null;
	
	@Before
	public void before(){
		Trader raoul=new Trader("Raoul","Cambridge");
		Trader mario=new Trader("Mario","Milan");
		Trader alan=new Trader("Alan","Cambridge");
		Trader brian=new Trader("Brian","Cambridge");
		
		transaction= Arrays.asList(
				new Transaction(brian, 2011, 300),
				new Transaction(raoul, 2012, 1000),
				new Transaction(raoul, 2011, 400),
				new Transaction(mario, 2012, 710),
				new Transaction(mario, 2012, 700),
				new Transaction(alan, 2012, 950)
		);
	}
	
	//1.找出2011年发生的所有交易，并按交易额排序(从低到高)
	@Test
	public void test1(){
		transaction.stream()
		           .filter((e)->e.getYear()==2011)
		           .sorted((e1,e2)->Integer.compare(e1.getValue(), e2.getValue()))
		           .forEach(System.out::println);
	}
	
	//2.交易员都在哪些不同的城市工作过？
	@Test
	public void test2(){
		transaction.stream()
				   .map((e)->e.getTrader().getCity())
				   .distinct()//去重
				   .forEach(System.out::println);
	}
	
	//3.查找所有来自剑桥的交易员，并按姓名排序
	@Test
	public void test3(){
		transaction.stream()
				   .filter((e)->e.getTrader().getCity().equals("Cambridge"))
				   .map(Transaction::getTrader)
				   .sorted((e1,e2)->e1.getName().compareTo(e2.getName()))
				   .distinct()
				   .forEach(System.out::println);
	}
	
	//4.返回所有交易员的姓名字符串，按字母顺序排序
	@Test
	public void test4(){
		transaction.stream()
				   .map(Transaction::getTrader)
				   .map(Trader::getName)
				   .distinct()
				   .sorted()
				   .forEach(System.out::println);
		
		System.out.println("-------------------------");
		
		String str=transaction.stream()
							  .map((e)->e.getTrader().getName())
							  .distinct()
							  .sorted()
							  .reduce("", String::concat);
		System.out.println(str);//AlanBrianMarioRaoul
		
		System.out.println("-------------------------");
		
		 transaction.stream()
		 			.map((t)->t.getTrader().getName())
		 			.flatMap(TestTransaction::filterCharacter)//返回的每个String合成一个流
		 			.sorted((s1,s2)->s1.compareToIgnoreCase(s2))
		 			.forEach(System.out::print);//aaaaaAaBiiilllMMnnoooorRRrruu
	}
	public static Stream<String> filterCharacter(String str){
		List<String> list=new ArrayList<>();
		for(Character ch:str.toCharArray()){
			list.add(ch.toString());
		}
		return list.stream();
	}
	
	//5.有没有交易员是在米兰工作的？
	@Test
	public void test5(){
		boolean b1=transaction.stream()
			                  .anyMatch((t)->t.getTrader().getCity().equals("Milan"));
		System.out.println(b1);
	}
	
	//6.打印生活在剑桥的交易员的所有交易额
	@Test
	public void test6(){
		Optional<Integer> sum=transaction.stream()
										 .filter((e)->e.getTrader().getCity().equals("Cambridge"))
										 .map(Transaction::getValue)
										 .reduce(Integer::sum);
		System.out.println(sum.get());
	}
	
	//7.所有交易中，最高的交易额是多少
	@Test
	public void test7(){
		Optional<Integer> max=transaction.stream()
				                         .map((t)->t.getValue())
				                         .max(Integer::compare);
		System.out.println(max.get());
	}
	
	//8.找到交易额最小的交易
	@Test
	public void test8(){
		Optional<Transaction> op=transaction.stream()
				                            .min((t1,t2)->Integer.compare(t1.getValue(), t2.getValue()));
		System.out.println(op.get());
	}
}

